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<!DOCTYPE html> <html> <body> <video id="myVideo" controls src="movie.ogg"> Your browser does not support the video tag. </video> <p>Click the button to change the URL of the video.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> var x = document.getElementById("myVideo"); function myFunction() { isSupp = x.canPlayType("video/mp4"); if (isSupp == "") { x.src = "mov_bbb.ogg"; } else { x.src = "mov_bbb.mp4"; } x.load(); document.getElementById("demo").innerHTML = "Video Courtesy of Big Buck Bunny - www.bigbuckbunny.org"; } </script> </body> </html>